For some reason salesmen spend most of their time asking questions they already know the answers to. They rarely ask to discover anything new.
Chris Murray, The Extremely Successful Salesman's Club
A failure is not one who has attempted and failed but one who has failed to attempt for fear of failing.
Chinonye J. Chidolue
So open questions to understand. Closed questions to confirm and gain commitment.
Chris Murray, The Extremely Successful Salesman's Club